At 23.31 hours on 19 Oct 1940 the Shirak (Master Lawrence Robert Morrison) in convoy HX-79 was hit by a stern torpedo from U-47 (Prien), caught fire for a short time and fell behind convoy where the crew abandoned ship. At 00.24 hours on 20 October, the tanker was hit amidships by torpedo from U-48 caught again fire and sank about 90 miles southwest of Rockall. The master and 36 crew members were picked up by HMS Blackfly (FY 1173) (Lt A.P. Hughes, RNR) and landed at Belfast.